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Date: Fri, 03 Jun 2022 08:33:13 +0200
From: Peter Korsgaard <peter@...sgaard.com>
To: Tanmay Shah <tanmay.shah@...inx.com>
Cc: <bjorn.andersson@...aro.org>, <mathieu.poirier@...aro.org>,
<robh+dt@...nel.org>, <krzk+dt@...nel.org>,
<michal.simek@...inx.com>, <ben.levinsky@...inx.com>,
<linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<openamp-system-reference@...ts.openampproject.org>
Subject: Re: [PATCH v8 1/6] dt-bindings: remoteproc: Add Xilinx RPU
subsystem bindings
>>>>> "Tanmay" == Tanmay Shah <tanmay.shah@...inx.com> writes:
Hi,
> Xilinx ZynqMP platform has dual-core ARM Cortex R5 Realtime Processing
> Unit(RPU) subsystem. This patch adds dt-bindings for RPU subsystem
> (cluster).
> Signed-off-by: Tanmay Shah <tanmay.shah@...inx.com>
> ---
> Changes in v8:
> - Add 'items:' for sram property
> Changes in v7:
> - Add minItems in sram property
> Changes in v6:
> - Add maxItems to sram and memory-region property
> Changes in v5:
> - Add constraints of the possible values of xlnx,cluster-mode property
> - fix description of power-domains property for r5 core
> - Remove reg, address-cells and size-cells properties as it is not required
> - Fix description of mboxes property
> - Add description of each memory-region and remove old .txt binding link
> reference in the description
> Changes in v4:
> - Add memory-region, mboxes and mbox-names properties in example
> Changes in v3:
> - None
> .../bindings/remoteproc/xlnx,r5f-rproc.yaml | 130 ++++++++++++++++++
> include/dt-bindings/power/xlnx-zynqmp-power.h | 6 +
> 2 files changed, 138 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml
> diff --git a/Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml
> new file mode 100644
> index 000000000000..adfe05ff157a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml
> @@ -0,0 +1,132 @@
> +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/remoteproc/xlnx,r5f-rproc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Xilinx R5F processor subsystem
> +
> +maintainers:
> + - Ben Levinsky <ben.levinsky@...inx.com>
> + - Tanmay Shah <tanmay.shah@...inx.com>
> +
> +description: |
> + The Xilinx platforms include a pair of Cortex-R5F processors (RPU) for
> + real-time processing based on the Cortex-R5F processor core from ARM.
> + The Cortex-R5F processor implements the Arm v7-R architecture and includes a
> + floating-point unit that implements the Arm VFPv3 instruction set.
> +
> +properties:
> + compatible:
> + const: xlnx,zynqmp-r5fss
> +
> + xlnx,cluster-mode:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [0, 1, 2]
A textual mode ("dual", "lock-step", "single") would be more readable.
> + description: |
> + The RPU MPCore can operate in split mode(Dual-processor performance), Safety
space missing before "(Dual-processor"
> + lock-step mode(Both RPU cores execute the same code in lock-step,
> + clock-for-clock) or Single CPU mode (RPU core 0 can be held in reset while
"can be" sounds a bit weak, perhaps "is"
> + core 1 runs normally). The processor does not support dynamic configuration.
> + Switching between modes is only permitted immediately after a processor reset.
> + If set to 1 then lockstep mode and if 0 then split mode.
> + If set to 2 then single CPU mode. When not defined, default will be lockstep mode.
This looks a bit confusing. If you decide to stick to the numerical
modes, then at least list them in numerical order, E.G.:
0: split
1: lockstep
2: single
> +
> +patternProperties:
> + "^r5f-[a-f0-9]+$":
> + type: object
> + description: |
> + The RPU is located in the Low Power Domain of the Processor Subsystem.
> + Each processor includes separate L1 instruction and data caches and
> + tightly coupled memories (TCM). System memory is cacheable, but the TCM
> + memory space is non-cacheable.
> +
> + Each RPU contains one 64KB memory and two 32KB memories that
> + are accessed via the TCM A and B port interfaces, for a total of 128KB
> + per processor. In lock-step mode, the processor has access to 256KB of
> + TCM memory.
> +
> + properties:
> + compatible:
> + const: xlnx,zynqmp-r5f
> +
> + power-domains:
> + description: RPU core PM domain specifier
> + maxItems: 1
A bit more detail would be good, E.G. something like arm/cpus.yaml does:
List of phandles and PM domain specifiers, as defined by bindings of the
PM domain provider (see also ../power_domain.txt).
And the phandle-array ref.
> +
> + mboxes:
> + minItems: 1
> + items:
> + - description: mailbox channel to send data to RPU
> + - description: mailbox channel to receive data from RPU
> +
> + mbox-names:
> + minItems: 1
> + items:
> + - const: tx
> + - const: rx
And here as well for mailbox/mailbox.txt
> +
> + sram:
> + $ref: /schemas/types.yaml#/definitions/phandle-array
> + minItems: 1
> + maxItems: 8
> + items:
> + maxItems: 1
> + description: |
> + phandles to one or more reserved on-chip SRAM regions. Other than TCM,
> + the RPU can execute instructions and access data from, the OCM memory,
> + the main DDR memory, and other system memories.
Drop the comma after "from"
> +
> + The regions should be defined as child nodes of the respective SRAM
> + node, and should be defined as per the generic bindings in,
Drop the comma after "in"
> + Documentation/devicetree/bindings/sram/sram.yaml
> +
> + memory-region:
> + description: |
> + List of phandles to the reserved memory regions associated with the
> + remoteproc device. This is variable and describes the memories shared with
> + the remote processor (e.g. remoteproc firmware and carveouts, rpmsg
> + vrings, ...). This reserved memory region will be allocated on DDR memory.
s/on DDR/in DDR/
> + minItems: 1
> + maxItems: 8
> + items:
> + - description: region used for RPU firmware image section
> + - description: vdev buffer
> + - description: vring0
> + - description: vring1
> + additionalItems: true
> +
> + required:
> + - compatible
> + - power-domains
> +
> + unevaluatedProperties: false
> +
> +required:
> + - compatible
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + r5fss: r5fss {
> + compatible = "xlnx,zynqmp-r5fss";
> + xlnx,cluster-mode = <1>;
> +
> + r5f-0 {
> + compatible = "xlnx,zynqmp-r5f";
> + power-domains = <&zynqmp_firmware 0x7>;
> + memory-region = <&rproc_0_fw_image>, <&rpu0vdev0buffer>, <&rpu0vdev0vring0>, <&rpu0vdev0vring1>;
> + mboxes = <&ipi_mailbox_rpu0 0>, <&ipi_mailbox_rpu0 1>;
> + mbox-names = "tx", "rx";
> + };
> +
> + r5f-1 {
> + compatible = "xlnx,zynqmp-r5f";
> + power-domains = <&zynqmp_firmware 0x8>;
> + memory-region = <&rproc_1_fw_image>, <&rpu1vdev0buffer>, <&rpu1vdev0vring0>, <&rpu1vdev0vring1>;
> + mboxes = <&ipi_mailbox_rpu1 0>, <&ipi_mailbox_rpu1 1>;
> + mbox-names = "tx", "rx";
> + };
> + };
> +...
> diff --git a/include/dt-bindings/power/xlnx-zynqmp-power.h b/include/dt-bindings/power/xlnx-zynqmp-power.h
> index 0d9a412fd5e0..618024cbb20d 100644
> --- a/include/dt-bindings/power/xlnx-zynqmp-power.h
> +++ b/include/dt-bindings/power/xlnx-zynqmp-power.h
> @@ -6,6 +6,12 @@
> #ifndef _DT_BINDINGS_ZYNQMP_POWER_H
> #define _DT_BINDINGS_ZYNQMP_POWER_H
> +#define PD_RPU_0 7
> +#define PD_RPU_1 8
> +#define PD_R5_0_ATCM 15
> +#define PD_R5_0_BTCM 16
> +#define PD_R5_1_ATCM 17
> +#define PD_R5_1_BTCM 18
> #define PD_USB_0 22
> #define PD_USB_1 23
> #define PD_TTC_0 24
> --
> 2.25.1
--
Bye, Peter Korsgaard
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